You can also put a little electric heater down there in the basement if it gets too cold. I have used one of those ceramic disc heaters before.
2000 Ford 4x4 Crewcab Dually 7.3 PSD
2015 Seismic 3712
2013 Jay Flight 32BHDS (sold)
2009 Jay Flight 31BHS (sold)
2005 Jay Flight 27BH (sold) - probably my favorite